The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Farey Sequence in all languages in chars. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 801st msbranicky 535 117 139ms 2 Jan 2024 802nd blaztoma 🇱🇹 534 78 49ms 4 Nov 2025 803rd dokutan 534 104 847ms 29 Oct 2024 804th madex 🇩🇪 533 105 11ms 21 May 2024 805th MeWhenI 🇻🇦 532 84 2ms 1 Dec 2023 806th KatieLG 🇬🇧 530 109 57ms 5 Oct 2025 807th janbehrens 🇩🇪 530 138 400ms 17 Apr 2025 808th Yewzir 🇧🇪 529 150 3ms 29 Mar 2024 809th HumanoidCPU 529 153 92ms 16 Nov 2025 810th Bmrl7 528 106 11ms 26 Mar 2024 811th anarconic 527 125 2ms 11 Dec 2023 812th YAJUE114514 527 138 146ms 23 Jul 2025 813th Yewzir 🇧🇪 525 117 88ms 5 Feb 2024 814th msbranicky 522 152 3ms 2 Jan 2024 815th snoozingnewt 🇨🇦 521 121 1,676ms 15 Oct 2025 816th steffan-polygolf 521 133 11ms 29 Feb 2024 817th neihousaigaai 519 108 12ms 11 Feb 2024 818th dokutan 517 121 119ms 29 Oct 2024 819th JDiLenarda 🇫🇷 517 122 1,326ms 13 Sep 2024 820th snoozingnewt 🇨🇦 516 125 2ms 15 Oct 2025 821st aksyristos 515 81 54ms 30 Nov 2024 822nd Bodo171 514 109 10ms 1 Jul 2024 822nd trist224 🇫🇷 514 109 13ms 3 Aug 2025 824th JunkIce 513 104 370ms 3 Dec 2024 825th Kokusui 🇯🇵 513 108 4ms 26 Jul 2024 826th KatieLG 🇬🇧 510 109 1,050ms 2 Jan 2024 827th rollershutter 509 110 11ms 20 Dec 2023 827th fourth-bit 509 110 21ms 1 Jul 2024 827th jipsong 🇩🇪 509 110 20ms 5 Jul 2025 830th snoozingnewt 🇨🇦 509 136 9ms 15 Oct 2025 831st dokutan 509 156 3ms 26 Oct 2024 832nd snoozingnewt 🇨🇦 508 143 4,516ms 15 Oct 2025 833rd msbranicky 507 116 112ms 1 Jan 2024 834th typeswitch-dev 🇵🇹 507 151 5ms 25 Jun 2024 835th alphafalfa 506 107 2ms 26 Aug 2024 836th dokutan 505 100 7ms 28 Oct 2024 837th minhtrancccp 505 111 10ms 1 Dec 2023 837th croc54 505 111 20ms 30 Dec 2024 837th Mikey-Beep 🇬🇧 505 111 21ms 24 Jul 2025 837th CommandLeo 🇮🇹 505 111 21ms 1 Nov 2025 841st MeWhenI 🇻🇦 505 132 90ms 1 Dec 2023 842nd snoozingnewt 🇨🇦 502 133 86ms 15 Oct 2025 843rd msbranicky 501 111 976ms 2 Jan 2024 844th KatieLG 🇬🇧 501 170 5ms 3 Dec 2023 845th knutae 🇳🇴 500 112 21ms 16 Dec 2023 846th scpchicken 🇵🇼 497 90 3ms 13 Dec 2023 847th janbehrens 🇩🇪 496 97 720ms 9 Jan 2024 848th mathisfun271 496 113 19ms 23 Dec 2023 849th msbranicky 496 142 17ms 6 Jan 2024 850th Yewzir 🇧🇪 494 112 6ms 5 Feb 2024 851st dokutan 492 163 117ms 6 Nov 2024 852nd snoozingnewt 🇨🇦 491 116 694ms 15 Oct 2025 853rd dokutan 488 111 2ms 28 Apr 2025 854th anarconic 487 115 10ms 11 Dec 2023 854th moustave 487 115 20ms 19 Nov 2024 854th damoose717 487 115 20ms 23 May 2025 857th HumanEquivalentUnit 487 133 14ms 5 Dec 2023 858th Protothor 485 119 10ms 20 Jul 2025 859th snoozingnewt 🇨🇦 484 112 2ms 15 Oct 2025 860th NanduBC 483 116 11ms 6 Sep 2024 861st msbranicky 483 130 2ms 2 Jan 2024 862nd msbranicky 482 134 2ms 2 Jan 2024 863rd Yewzir 🇧🇪 481 100 238ms 26 Feb 2024 864th tomh1012 481 152 418ms 12 Nov 2025 865th madeforlosers 479 113 2ms 8 Dec 2023 866th dokutan 478 140 40ms 29 Oct 2024 867th snoozingnewt 🇨🇦 475 167 3ms 15 Oct 2025 868th MaxCastella 🇫🇷 473 89 780ms 1 Dec 2023 869th dokutan 473 149 19ms 18 days ago 870th RockOfStone 471 140 4ms 23 Mar 2024 871st msbranicky 469 118 4ms 2 Jan 2024 871st dokutan 469 118 4ms 10 Apr 2025 873rd trinityy-7 469 123 22ms 6 Dec 2023 874th Feniske 🇫🇷 468 90 293ms 1 Dec 2023 875th emgordon154 467 62 3ms 1 Oct 2025 876th dokutan 467 135 1,299ms 31 Mar 2025 877th dokutan 466 126 110ms 26 Oct 2024 878th HumanoidCPU 466 132 95ms 5 Jun 2024 879th msbranicky 465 144 40ms 2 Jan 2024 880th AsbestosSniffer 464 184 1,167ms 1 Dec 2023 First Prev 801–880 of 1,473 Next Last